| 发明名称 |
Light quantity adjusting device. |
| 摘要 |
<p>A light quantity adjusting device adjusts the quantity of light by moving a light quantity adjusting member by means of an electromagnetic driving part. The device includes a circuit arranged to drive the electromagnetic driving part by producing a pulse output at a period which is shorter than the time constant of the electromagnetic driving part. <IMAGE></p> |
| 申请公布号 |
EP0440927(A2) |
申请公布日期 |
1991.08.14 |
| 申请号 |
EP19900123859 |
申请日期 |
1990.12.11 |
| 申请人 |
CANON DENSHI KABUSHIKI KAISHA |
发明人 |
SATO, OSAMU, C/O CANON DENSHI KABUSHIKI KAISHA |
| 分类号 |
G03B7/10;G02B7/28;G03B9/02;G03B13/36;H04N5/238 |
主分类号 |
G03B7/10 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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